import {asyncRouterMap, constantRouterMap} from '@/router'

/**
 * 通过meta.role判断是否与当前用户权限匹配
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return roles.some(role => route.meta.roles.indexOf(role) >= 0)
  } else {
    return true
  }
}

/**
 * 递归过滤异步路由表，返回符合用户角色权限的路由表
 * @param asyncRouterMap
 * @param roles
 */
function filterAsyncRouter(asyncRouterMap, roles) {
  const accessedRouters = asyncRouterMap.filter(route => {
    if (hasPermission(roles, route)) {
      if (route.children && route.children.length) {
        route.children = filterAsyncRouter(route.children, roles)
      }
      return true
    }
    return false
  })
  return accessedRouters
}

const permission = {
  state: {
    routers: constantRouterMap,
    addRouters: []
  },
  mutations: {
    SET_ROUTERS: (state, routers) => {
      state.addRouters = routers
      state.routers = constantRouterMap.concat(routers)
    }
  },
  actions: {
    GenerateRoutes({commit},pages) {
      return new Promise(resolve => {
        let _roles = [];
        pages.forEach(item =>{
          _roles.push(item.code);
        })
        let accessedRouters = filterAsyncRouter(asyncRouterMap, _roles)
        accessedRouters.forEach(item=>{
          let _flg = false;
          if(item.children && item.children.length) {
            let _childFlg = true;
            item.children.forEach(item=>{
              if(!item.hasOwnProperty('hidden')) {
                _childFlg = false;
              }
            })
            _flg = _childFlg;
          } else  {
            _flg = true;
          }
          item.hidden = _flg;
        })
        commit('SET_ROUTERS', accessedRouters);
        resolve()
      })
    }
  }
}

export default permission
